Answer:
The products of photosynthesis are the reactants of aerobic cellular respiration, and the products of aerobic cellular respiration are the reactants of photosynthesis. In chemical equations the reactants are written on the left side of the arrow and the products are written on the right side of the equation.
Photosynthesis
6CO2 + 6H2O → C6H12O6 + 6O2
Carbon dioxide plus water produces glucose plus oxygen.
Aerobic cellular respiration
C6H12O6 + 6O2 → 6CO2 + 6H2O
Glucose plus oxygen produces carbon dioxide and water.